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Temperature-sensitive plugging cement paste for oil well cementation and preparation method of temperature-sensitive plugging cement paste

A mud and oil well technology, which is applied in the field of oil well cementing temperature-sensitive plugging cement slurry and its preparation, can solve the problems of low cement strength and no temperature-sensitive plugging, and achieve low pumping pressure and good plugging The effect, the effect of good application prospects

Inactive Publication Date: 2019-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent application number CN201210162286.4 discloses a new type of cement slurry plugging fluid that has a stronger plugging and pressure-bearing capacity for different crack sizes. Compared with fiber plugging cement slurry, the plugging fluid has a stronger plugging capacity. It is better able to adapt to complex downhole lost formations; not only has good plugging ability, but also has a lower cement strength after solidification, which prevents the problem of "new wellbore" caused by the difficulty of drilling plugs after the plugging fluid solidifies, but does not provide temperature sensitive plugging cement slurry

Method used

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  • Temperature-sensitive plugging cement paste for oil well cementation and preparation method of temperature-sensitive plugging cement paste
  • Temperature-sensitive plugging cement paste for oil well cementation and preparation method of temperature-sensitive plugging cement paste
  • Temperature-sensitive plugging cement paste for oil well cementation and preparation method of temperature-sensitive plugging cement paste

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Experimental program
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Effect test

Embodiment 1

[0035]

[0036] The fluid loss reducer used is DZJ-Y (AMPS multi-polymer copolymer) produced by Sinopec Engineering Institute, the retarder is DZH-2 (organic phosphoric acid) produced by Sinopec Engineering Institute, and the filler is micro silicon (400 mesh). The foaming agent is DZX (silicon oil) produced by Sinopec Engineering Institute; the particle size of rubber powder is 500um~3mm, and the particle size of vermiculite is 0.5mm~4mm.

[0037] The preparation method of temperature-sensitive shape-memory polymer particles is as follows: styrene-butadiene temperature-sensitive shape-memory polymer (the shape-memory deformation temperature is 50-110°C, purchased from Dezhou Continental Shelf Petroleum Engineering Technology Co., Ltd.) After freezing and crushing, the temperature after liquid nitrogen cryogenic freezing is -10°C to -20°C, and the temperature-sensitive shape memory polymer after crushing is 20 mesh to 80 mesh. The fibers are polypropylene fiber (polypropyle...

Embodiment 2

[0041]

[0042] The lightening agent used is fly ash, the water loss reducing agent is FSAM (PVA polymer) produced by Sinopec Engineering Institute, the retarder is DZH-2 produced by Sinopec Engineering Institute, the filler is micro silicon (400 mesh), defoaming The agent is DZX produced by Sinopec Engineering Institute, the particle size range of fruit shell is 0.5-5mm, the particle size of rubber powder is 500um-3mm, and the particle size of vermiculite is 0.5mm-4mm.

[0043] The preparation method of temperature-sensitive shape-memory polymer particles is as follows: styrene-butadiene temperature-sensitive shape-memory polymer (the shape-memory deformation temperature is 50-110°C, purchased from Dezhou Continental Shelf Petroleum Engineering Technology Co., Ltd.) After freezing and crushing, the temperature after liquid nitrogen cryogenic freezing is -10°C to -20°C, and the temperature-sensitive shape memory polymer after crushing is 20 mesh to 80 mesh. The fibers are p...

Embodiment 3

[0047]

[0048] The lightening agent used is fly ash, the water loss reducer is FSAM (polyvinyl alcohol polymer) produced by Sinopec Engineering Institute, the retarder is DZH-2 produced by Sinopec Engineering Institute, and the filler is micro silicon (400 mesh). The foaming agent is DZX, and the rubber powder particle size is 500um~3mm. Vermiculite particle size is 0.5mm ~ 4mm.

[0049] The preparation method of temperature-sensitive shape-memory polymer particles is as follows: the temperature-sensitive shape-memory polymer of styrene-butyl acrylate copolymer (the shape-memory deformation temperature is 50-110°C, purchased from Dezhou Continental Shelf Petroleum Engineering Technology Co., Ltd.) Nitrogen cryogenically freezes and pulverizes, liquid nitrogen freezes at a temperature of -10°C to -20°C, and the pulverized temperature-sensitive shape memory polymer is 20 mesh to 80 mesh. The fibers are polypropylene fiber (polypropylene fiber) and polyvinyl chloride fiber (...

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Abstract

The invention relates to a temperature-sensitive plugging cement paste for oil well cementation and a preparation method of the temperature-sensitive plugging cement paste. The temperature-sensitive plugging cement paste for oil well cementation contains the following components in parts by weight: 100 parts of cement, 0-55 parts of lightening admixture, 1-20 parts of fluid loss agent, 0.1-10 parts of set retarder, 0-20 parts of filler, 0.1-10 parts of defoaming agent, 0.1-10 parts of temperature-sensitive shape memory polymer particles, 0-10 parts of fruit husks, 1-10 parts of rubber powder,1-10 parts of vermiculite and 20-150 parts of water. The temperature-sensitive plugging cement paste for oil well cementation, disclosed by the invention, has a good effect on plugging cracks with different sizes and has the advantages such as good plugging effect, relatively low pumping pressure and no influences to thickening time and later strength development of the cement paste for well cementation as comparison with a plugging paste made of a single inorganic material.

Description

technical field [0001] The invention relates to the field of oil well cementing, and more particularly relates to an oil well cementing temperature-sensitive plugging cement slurry and a preparation method thereof. Background technique [0002] In the process of drilling oil and gas wells, lost circulation is a problem that is often encountered in drilling engineering. Once a vicious leak occurs in a well, it will not only lose a lot of manpower and material resources, but also prolong the drilling cycle and cause great economic losses. During the drilling process, the fluid column pressure in the downhole is greater than the pressure bearing capacity of the formation, resulting in lost circulation. After the lost circulation, the lost circulation agent is mainly used to stop the lost circulation. There are different characteristics of the lost circulation agent in the domestic market, including plant fiber. , such as cotton fibers, peanut shells, walnut shells, etc.; there ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09K8/467C04B18/02
CPCC04B18/02C04B28/00C09K8/426C09K8/467C04B24/24C04B24/003C04B18/146C04B24/42C04B14/202C04B22/002C04B24/2676C04B16/0633C04B16/0616C04B18/08C04B24/2623C04B2103/22C04B2103/50C04B18/24
Inventor 刘飞刘学鹏周仕明张林海方春飞杨红歧刘仍光
Owner CHINA PETROLEUM & CHEM CORP
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